Evra is 33 years old and If I'm not mistakin' last season he had some injuries in Man Utd too.
Caceres had injured knee if I remember good in the Conte era and he injured it several times until he had a surgery. Under Conte when he played continuously 2-3 games he always had problems with the muscles in the upper part of the leg ( forgot the name).
Marrone simply got injured as every player does in some season